Date comparison - How to check if 20 minutes have passed?

Question

How to check if 20 minutes have passed from current date?

For example:

var start = DateTime.Now;
var oldDate = \"08/10/2011 23:50:31\"; 

    if(start ?         


        

Answer 1

var start = DateTime.Now;
var oldDate = DateTime.Parse("08/10/2011 23:50:31"); 

    if(start.Subtract(oldDate) >= TimeSpan.FromMinutes(20)) 
    {
     //20 minutes were passed from start
    }